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MCP23S17T-E/SP Datasheet(PDF) 9 Page - Microchip Technology |
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MCP23S17T-E/SP Datasheet(HTML) 9 Page - Microchip Technology |
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9 / 48 page  © 2007 Microchip Technology Inc. DS21952B-page 9 MCP23017/MCP23S17 1.5 GPIO Port The GPIO module is a general purpose, 16-bit wide, bidirectional port that is functionally split into two 8-bit wide ports. The GPIO module contains the data ports (GPIOn), internal pull-up resistors and the output latches (OLATn). Reading the GPIOn register reads the value on the port. Reading the OLATn register only reads the latches, not the actual value on the port. Writing to the GPIOn register actually causes a write to the latches (OLATn). Writing to the OLATn register forces the associated output drivers to drive to the level in OLATn. Pins configured as inputs turn off the associated output driver and put it in high-impedance. TABLE 1-3: SUMMARY OF REGISTERS ASSOCIATED WITH THE GPIO PORTS (BANK = 1) TABLE 1-4: SUMMARY OF REGISTERS ASSOCIATED WITH THE GPIO PORTS (BANK = 0) Register Name Address (hex) bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 POR/RST value IODIRA 00 IO7 IO6 IO5 IO4 IO3 IO2 IO1 IO0 1111 1111 IPOLA 01 IP7 IP6 IP5 IP4 IP3 IP2 IP1 IP0 0000 0000 GPINTENA 02 GPINT7 GPINT6 GPINT5 GPINT4 GPINT3 GPINT2 GPINT1 GPINT0 0000 0000 GPPUA 06 PU7 PU6 PU5 PU4 PU3 PU2 PU1 PU0 0000 0000 GPIOA 09 GP7 GP6 GP5 GP4 GP3 GP2 GP1 GP0 0000 0000 OLATA 0A OL7 OL6 OL5 OL4 OL3 OL2 OL1 OL0 0000 0000 IODIRB 10 IO7 IO6 IO5 IO4 IO3 IO2 IO1 IO0 1111 1111 IPOLB 11 IP7 IP6 IP5 IP4 IP3 IP2 IP1 IP0 0000 0000 GPINTENB 12 GPINT7 GPINT6 GPINT5 GPINT4 GPINT3 GPINT2 GPINT1 GPINT0 0000 0000 GPPUB 16 PU7 PU6 PU5 PU4 PU3 PU2 PU1 PU0 0000 0000 GPIOB 19 GP7 GP6 GP5 GP4 GP3 GP2 GP1 GP0 0000 0000 OLATB 1A OL7 OL6 OL5 OL4 OL3 OL2 OL1 OL0 0000 0000 Register Name Address (hex) bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 POR/RST value IODIRA 00 IO7 IO6 IO5 IO4 IO3 IO2 IO1 IO0 1111 1111 IODIRB 01 IO7 IO6 IO5 IO4 IO3 IO2 IO1 IO0 1111 1111 IPOLA 02 IP7 IP6 IP5 IP4 IP3 IP2 IP1 IP0 0000 0000 IPOLB 03 IP7 IP6 IP5 IP4 IP3 IP2 IP1 IP0 0000 0000 GPINTENA 04 GPINT7 GPINT6 GPINT5 GPINT4 GPINT3 GPINT2 GPINT1 GPINT0 0000 0000 GPINTENB 05 GPINT7 GPINT6 GPINT5 GPINT4 GPINT3 GPINT2 GPINT1 GPINT0 0000 0000 GPPUA 0C PU7 PU6 PU5 PU4 PU3 PU2 PU1 PU0 0000 0000 GPPUB 0D PU7 PU6 PU5 PU4 PU3 PU2 PU1 PU0 0000 0000 GPIOA 12 GP7 GP6 GP5 GP4 GP3 GP2 GP1 GP0 0000 0000 GPIOB 13 GP7 GP6 GP5 GP4 GP3 GP2 GP1 GP0 0000 0000 OLATA 14 OL7 OL6 OL5 OL4 OL3 OL2 OL1 OL0 0000 0000 OLATB 15 OL7 OL6 OL5 OL4 OL3 OL2 OL1 OL0 0000 0000 |
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